中华放射肿瘤学杂志
中華放射腫瘤學雜誌
중화방사종류학잡지
CHINESE JOURNAL OF RADIATION ONCOLOGY
2014年
3期
256-258
,共3页
XGS-10系统%OBI系统%摆位误差
XGS-10繫統%OBI繫統%襬位誤差
XGS-10계통%OBI계통%파위오차
XGS-10 system%On board imager system%Setup error
目的 比较采用千伏级XGS-10与OBI系统在头颈部肿瘤IMRT中的摆位误差和图像采集、配准所需时间差异.方法 30例头颈部患者IMRT前分别采用OBI系统获取CBCT图像及XGS-10系统获取X线图像,将2套图像与计划图像及其靶中心匹配,分别得出靶中心左右、上下、前后方向摆位误差数据.采用Pearson法相关分析2套系统分别在3个方向上的相关性及一致性的可信区间.结果 左右、上下、前后方向摆位误差XGS-10系统的分别为(-1.03 ±2.15)、(0.86±2.59)、(0.42±1.66) mm,OBI系统的分别为(0.00±1.68)、(1.53±2.12)、(0.10±1.54) mm,二者差值分别为(-1.03±1.24)、(-0.68±1.78)、(0.32±1.61) mm.二者在左右、上下、前后方向的相关系数分别为0.817、0.731、0.495,95％CI值分别为(-1.47～-0.59)、(-1.32～0.04)、(-0.26 ～0.90)mm.XGS-10获取图像、配准平均时间分别为10s和＜15s,OBI的需3 min和8 min.结论 XGS-10系统与OBI系统均可提高摆位精度,但XGS-10系统可缩短摆位及摆位误差纠正时间.
目的 比較採用韆伏級XGS-10與OBI繫統在頭頸部腫瘤IMRT中的襬位誤差和圖像採集、配準所需時間差異.方法 30例頭頸部患者IMRT前分彆採用OBI繫統穫取CBCT圖像及XGS-10繫統穫取X線圖像,將2套圖像與計劃圖像及其靶中心匹配,分彆得齣靶中心左右、上下、前後方嚮襬位誤差數據.採用Pearson法相關分析2套繫統分彆在3箇方嚮上的相關性及一緻性的可信區間.結果 左右、上下、前後方嚮襬位誤差XGS-10繫統的分彆為(-1.03 ±2.15)、(0.86±2.59)、(0.42±1.66) mm,OBI繫統的分彆為(0.00±1.68)、(1.53±2.12)、(0.10±1.54) mm,二者差值分彆為(-1.03±1.24)、(-0.68±1.78)、(0.32±1.61) mm.二者在左右、上下、前後方嚮的相關繫數分彆為0.817、0.731、0.495,95％CI值分彆為(-1.47～-0.59)、(-1.32～0.04)、(-0.26 ～0.90)mm.XGS-10穫取圖像、配準平均時間分彆為10s和＜15s,OBI的需3 min和8 min.結論 XGS-10繫統與OBI繫統均可提高襬位精度,但XGS-10繫統可縮短襬位及襬位誤差糾正時間.
목적 비교채용천복급XGS-10여OBI계통재두경부종류IMRT중적파위오차화도상채집、배준소수시간차이.방법 30례두경부환자IMRT전분별채용OBI계통획취CBCT도상급XGS-10계통획취X선도상,장2투도상여계화도상급기파중심필배,분별득출파중심좌우、상하、전후방향파위오차수거.채용Pearson법상관분석2투계통분별재3개방향상적상관성급일치성적가신구간.결과 좌우、상하、전후방향파위오차XGS-10계통적분별위(-1.03 ±2.15)、(0.86±2.59)、(0.42±1.66) mm,OBI계통적분별위(0.00±1.68)、(1.53±2.12)、(0.10±1.54) mm,이자차치분별위(-1.03±1.24)、(-0.68±1.78)、(0.32±1.61) mm.이자재좌우、상하、전후방향적상관계수분별위0.817、0.731、0.495,95％CI치분별위(-1.47～-0.59)、(-1.32～0.04)、(-0.26 ～0.90)mm.XGS-10획취도상、배준평균시간분별위10s화＜15s,OBI적수3 min화8 min.결론 XGS-10계통여OBI계통균가제고파위정도,단XGS-10계통가축단파위급파위오차규정시간.
Objective To analyze the discrepancies between position adjustments obtained with the stereoscopic 2DKV XGS-10 system and the Varian OBI system for head-and-neck region IMRT treatments,and to compare for image acquisition and registration time.Methods CBCT images were obtained with OBI system and 2DKV images were acquired by XGS-10 system for 30 head-and-neck patients prior to Varian21EX IMRT treatment.The images were registered with planning image for localization,and position adjustments were given in LR,SI and AP directions,then the discrepancies between them were analyzed.On the comparison of the two different systems,the Pearson coefficient was used to analyzed the correlation and 95％ CI analysis to discern the consistence.Results Analysis of images acquired for the 30 patients yielded the following results:position adjustments with XGS-10 system were (-1.03 ± 2.15) mm,(0.86 ± 2.59) mm,(0.42 ± 1.66) mm in LR,SI and AP directions,whereas (0.00 ± 1.68) mm,(1.53 ± 2.12) mm,(0.10 ± 1.54) mm with CBCT in LR,SI and AP directions.The discrepancies were (-1.03 ± 1.24) mm,(-0.68 ± 1.78) mm and (0.32±1.61) mm in LR,SI and AP directions.The correlation coefficients between them were 0.817,0.731 and 0.495 in LR,SI and AP directions.95％ CI were (-1.47--0.59),(-1.32-0.04),(-0.26-0.90) mm.The average image acquisition and registration time were 10 s and ＜ 15 s in XGS-10 system,with 3 min and 8 min in OBI system.Conclusions Both of XGS-10 system and OBI system could be used to improve patient position accuracy,but XGS-10 system could cut down the total time.
